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Schmitz-Abe, Klaus; Ciesielski, Szymon J.; Schmidt, Paul J.; Campagna, Dean R.; Rahimov, Fedik; Schilke, Brenda A.; Cuijpers, Marloes; Rieneck, Klaus; Lausen, Birgitte; Linenberger, Michael L.; Sendamarai, Anoop K.; Guo, Chaoshe; Hofmann, Inga; Newburger, Peter E.; Matthews, Dana; Shimamura, Akiko; Snijders, Pieter J.L.M.; Towne, Meghan C.; Niemeyer, Charlotte M.; Watson, Henry G.; Dziegiel, Morten H.; Heeney, Matthew M.; May, Alison; Bottomley, Sylvia S.; Swinkels, Dorine W.; Markianos, Kyriacos; Craig, Elizabeth A.; Fleming, Mark D.
Blood, 12/2015, Volume: 126, Issue: 25Journal Article
The congenital sideroblastic anemias (CSAs) are relatively uncommon diseases characterized by defects in mitochondrial heme synthesis, iron-sulfur (Fe-S) cluster biogenesis, or protein synthesis. Here we demonstrate that mutations in HSPA9, a mitochondrial HSP70 homolog located in the chromosome 5q deletion syndrome 5q33 critical deletion interval and involved in mitochondrial Fe-S biogenesis, result in CSA inherited as an autosomal recessive trait. In a fraction of patients with just 1 severe loss-of-function allele, expression of the clinical phenotype is associated with a common coding single nucleotide polymorphism in trans that correlates with reduced messenger RNA expression and results in a pseudodominant pattern of inheritance. •Mutations in HSPA9 cause CSAs that may be inherited in a recessive or pseudodominant manner.•HSPA9 loss-of-function alleles are often inherited in trans with a common coding single nucleotide polymorphism associated with altered gene expression.
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